Shareholders' Equity (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2013 Series A and B $2.50 Cumulative Convertible Preferred Stock [Member]	Dec. 31, 2012 Series A and B $2.50 Cumulative Convertible Preferred Stock [Member]	Dec. 30, 2013 Series A and B $2.50 Cumulative Convertible Preferred Stock [Member]
Shareholders' Equity (Textual)
Common stock authorized under repurchase program	$ 200,000,000	$ 250,000,000
Stock repurchases, Shares		1,358,688
Payments for stock repurchases		(68,600,000)	0	0
Stock repurchased, value		0	0
Stock repurchases, shares		0	0
Common stock, shares authorized	120,000,000	120,000,000	120,000,000
Common stock, par value	$ 0.625	$ 0.625	$ 0.625
Common stock, shares issued	66,349,906	66,349,906	66,021,444
Common stock, shares outstanding	45,868,698	45,868,698	46,898,924
Preferred stock, shares authorized					5,000,000	(5,000,000)
Preferred stock, par value					$ 1.00	$ 1.00
Preferred stock, shares outstanding						15,567	15,567
Cumulative annual cash dividend per share on preferred stock					$ 2.50	$ 2.5
Preferred stock, aggregate liquidation preference						$ 900,000